Supporting Information Synthesis and evaluation of new 3-substituted-4-chloro- thioxanthone derivatives as potent anti-breast cancer agents Chun-Liang Chen a , Tsung-Chih Chen a , Chia-Chung Lee a , Liu-Chuan Shih b , Chih-Yuan Lin b , Ying-Yu Hsieh b , Ahmed Atef Ahmed Ali c, d , Hsu-Shan Huang a, b, c * a Graduate Institute of Cancer Biology and Drug Discovery, College of Medical Science and Technology, Taipei Medical University, Taipei 110, Taiwan, Republic of China b School of Pharmacy, National Defense Medical Center, Taipei 114, Taiwan, Republic of China c Graduate Institute of Life Sciences, National Defense Medical Center, Taipei 114, Taiwan, Republic of China d Institute of Molecular Biology, Academia Sinica, Taipei 115, Taiwan, Republic of China